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dc.contributor.authorBaja, Emmanuel Sen_US
dc.contributor.authorSchwartz, Joel Den_US
dc.contributor.authorCoull, Brent Aen_US
dc.contributor.authorWellenius, Gregory Aen_US
dc.contributor.authorVokonas, Pantel Sen_US
dc.contributor.authorSuh, Helen Hen_US
dc.date.accessioned2014-03-11T13:52:26Z
dc.date.issued2013en_US
dc.identifier.citationBaja, Emmanuel S, Joel D Schwartz, Brent A Coull, Gregory A Wellenius, Pantel S Vokonas, and Helen H Suh. 2013. “Structural equation modeling of parasympathetic and sympathetic response to traffic air pollution in a repeated measures study.” Environmental Health 12 (1): 81. doi:10.1186/1476-069X-12-81. http://dx.doi.org/10.1186/1476-069X-12-81.en
dc.identifier.issn1476-069Xen
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:11879777
dc.description.abstractBackground: Traffic-related air pollution has been associated to a range of adverse health impacts, including decreased heart rate variability (HRV). The association between traffic-related pollution and HRV, however, has varied by traffic-related or HRV marker as well as by study, suggesting the need for a more comprehensive and integrative approach to examining air pollution-mediated biological impacts on these outcomes. In a Bayesian framework, we examined the effect of traffic pollution on HRV using structural equation models (SEMs) and looked at effect modification by participant characteristics. Methods: We studied measurements of 5 HRV markers [high frequency (HF), low frequency (LF), 5-min standard deviation of normal-to-normal intervals (SDNN), square root of the mean squared differences of successive normal-to-normal intervals (rMSSD), and LF/HF ratio (LF/HF)] for 700 elderly men from the Normative Aging Study. Using SEMs, we fit a latent variable for traffic pollution that is reflected by levels of carbon monoxide, nitrogen monoxide, nitrogen dioxide, and black carbon (BC) to estimate its effect on latent variable for parasympathetic tone that included HF, SDNN and rMSSD, and the sympathetic tone marker, LF/HF. Exposure periods were assessed using 4-, 24-, 48-, 72-hour moving average pre-visit. We compared our main effect findings using SEMs with those obtained using linear mixed models. Results: Traffic pollution was not associated with mean parasympathetic tone and LF/HF for all examined moving averages. In Bayesian linear mixed models, however, BC was related to increased LF/HF, an inter quartile range (IQR) increase in BC was associated with a 6.5% (95% posterior interval (PI): -0.7%, 14.2%) increase in mean LF/HF 24-hours later. The strongest association observed was for the 4-hour moving average (10.1%; 95% PI: 3.0%, 17.6%). The effect of traffic on parasympathetic tone was stronger among diabetic as compared to non-diabetic participants. Specifically, an IQR increase in traffic pollution in the 48-hr prior to the clinic visit was associated with a 44.3% (95% PI: -67.7%, -4.2%) lower mean parasympathetic tone among diabetics, and a 7.7% (95% PI: -18.0%, 41.4%) higher mean parasympathetic tone among non-diabetics. Conclusions: BC was associated with adverse changes LF/HF in the elderly. Traffic pollution may decrease parasympathetic tone among diabetic elderly.en
dc.language.isoen_USen
dc.publisherBioMed Centralen
dc.relation.isversionofdoi:10.1186/1476-069X-12-81en
dc.relation.hasversionhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3907044/pdf/en
dash.licenseLAAen_US
dc.subjectBayesianen
dc.subjectDiabetesen
dc.subjectHRVen
dc.subjectObesityen
dc.subjectParasympathetic responseen
dc.subjectStructural equation modelsen
dc.subjectSympathetic response and Traffic air pollutionen
dc.titleStructural equation modeling of parasympathetic and sympathetic response to traffic air pollution in a repeated measures studyen
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden
dc.relation.journalEnvironmental Healthen
dash.depositing.authorBaja, Emmanuel Sen_US
dc.date.available2014-03-11T13:52:26Z
dc.identifier.doi10.1186/1476-069X-12-81*
dash.contributor.affiliatedBaja, Emmanuel S
dash.contributor.affiliatedCoull, Brent
dash.contributor.affiliatedSchwartz, Joel
dc.identifier.orcid0000-0002-2557-150X


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